Thermostat.



PATENTED JULY 7, 1903 J. D. GOULD.

' THERMOSTAT.

APPLICATION rum). F123. 7, 1902.

N0 MODEL.

WITNESSES 8 0 M M 0 w N UNITED STATES Patented July '7, 1903.

PATENT OFFICE.

JOHN D. GOULD, OF NEW YORK, N. Y.

THERMOSTAT.

"OPECIFICATION forming part of Letters Patent No. 733,184, dated July'7, 1903. Application filed February 7, 1902. seen No. 92,959. (No nidel.)

This invention relates to improvements in' thermostats in fire-alarmelectric circuits.

In my invention I employ a thermostatic conductorthat is, a conductorhaving a fusible lead and a copper or other similar lead insulated fromeach other and designed to become fused by heat, thus closing thealarmcircuit.

In the practical wiring of a building comparatively short lengths ofcable are used, and when the ends are left uncovered or open the softfusible wire when melted is apt to flow out at the end without closingthe circuit.

It is the object of my invention, therefore, to provide protecting orsealing coverings for the ends of the thermostatic sections which willprevent the outflow, as above mentioned, and thus insure the fusion ofthe conductors between the ends.

I will describe a thermostat embodying my invention and then point outthenovel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side view of a thermostat embodying my invention. Fig. 2is a longitudi nal section thereof, and Fig. 3 is a section on the line3 3 of Fig. 2.

Each section of the thermostat comprises a core 5, of a metal fusible ata comparatively low temperature, and an outer conductor 6, of strands ofwire or of a single wire. These conductors 5 and 6 are insulated onefrom the other by means of paper 7 or the like, cover ing the fusibleconductor, and the whole has an insulating-cover 8. For the purpose ofPractically, however, the two gaged over the end or ends of a sectionare sealing devices consisting of caps 10, of suitable insulatingmaterialsuch, for instance, as hard rubber or porcclainand placed withinthe same is a sealing material 11, of wax, shellac, or the like. Asclearly shown in Figs. 1 and 2, the several sections are connectedtogether by means of clamping-screws 12, engaging in a block 13 ofinsulating material. The caps 10 are provided with openings, either atthe sides or at the ends, through which portions of the wires mayextend. By this arrangement it will be seen that in case of fireattacking the wire or a section of the thermostat the heat will bepractically confined between the euds or cap-pieces and as the fusiblewire melts it will fuse or contact with the conductor 6, thus closingthe circuit.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent 1. Athermostatcomprising two conductors insulated onefrom the other, a covering for the two conductors, one conductor beingfusible, and a sealing device of insulating material forthe end of athermostatic section, sub stantially as specified.

2. Athermostat comprising two conductors, insulated from each other, acovering for the .two conductors, one conductor being fusible,

and caps of insulating material for engaging over the ends ofthe'conductors, substantially as specified.

3. A thermostatcomprising two conductors insulated from each other, acovering for the two conductors, one conductor being fusible, caps forengaging over the ends of the conductors, and sealing material in thecaps, substantially as specified.

4. A sectional thermostat, each section comprising two conductorsinsulated one from the other, a covering for the two conductors, one

conductor being fusible, caps of insulating material engaged over theends of the sections, the said caps having openings through which theconductors may pass, and a sealing material in the caps, substantiallyas specified.

5. A sectional thermostat, comprising sections of cables, each sectionincluding conductors, one of which is fusible, and a suitarated fromcontact with the other member by said insulation, of means connectedwith the opposite ends of the said thermostatic cable for preventingmovement of the fusible material under heatlongitudinally of theconducting member with which it is in contact and to effect movement ofthe fusible material laterally with relation to said conducting memberto effect the connection between the said conducting members, for thepurpose specified.

7. The combination with a thermostatic cable having a fusible member, ofpieces or blocks of insulating material covering the ends of thethermostatic cable to prevent movement of the fusible member in thedirection of the length of the wire under the influence of heat,substantially as and for the purpose specified.

8. The combination with a thermostatic cable having a fusible member, ofa device composed of insulating material for closing the ends of thecable against longitudinal movement of the fusible member under theinfluence of heat, substantially as described.

9. The combination with a thermostatic cable having a fusible member, ofdevices at the ends of said cable for closing the ends of the cableagainst longitudinal movement of the fusible metal, and terminals towhich said thermostatic cable is electricaily connected, for the purposespecified.

10. The combination with a thermostatic cable having a fusible member,of means extraneous to the cable for preventing movement of the fusiblemember longitudinally of the cable under the influence of heat, for thepurpose specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN D. GOULD.

Witnesses:

J NO. M. BITTER, O. R. FERGUSON.

